Description
Overview:
These Internal Lock Washers are mild-steel, internal-tooth washers designed to keep nuts and bolts tight under vibration and movement. With an inner diameter of 3/4 inch (19.05 mm), they suit standard 3/4 inch fasteners and sit beneath a nut or bolt head to increase friction and resist back-off. The inward-facing serrations bite into the mating surface for a secure hold without increasing the overall stack height. Made from durable mild steel for balanced strength and machinability, they are suitable for machinery, automotive, plant, and general industrial use, including construction and garden equipment. Sold individually for precise quantity control. Manufacturer Part Number: 915257.
Key Features:
- Internal serrations grip the mating surface to resist loosening from vibration
- 3/4 inch (19.05 mm) inner diameter for standard 3/4 inch bolts and studs
- Mild-steel construction offers dependable strength and consistent bite
- Low-profile design fits under bolt heads or nuts in confined assemblies
- Helps maintain clamp load in dynamic or high-vibration environments
- Simple to install with standard hand tools; no special hardware required
- Suitable for use with plain washers where surface protection is needed
- Sold individually to match exact project or maintenance requirements
Typical Applications:
Used where joints see shock, vibration, or thermal cycling, such as engine covers, guards, brackets, housings, pumps, compressors, gearboxes, frames, generators, mowers, compactors, and fixings on plant and workshop equipment. Common in automotive, agricultural, construction, and industrial assemblies where a 3/4 inch (19.05 mm) fastener is specified and maintaining a secure connection is essential.
Also known as:
Internal star washer, star lock washer, shakeproof washer, serrated star washer, internal-tooth washer, internal serrated washer. These terms describe washers with inward-facing teeth that improve grip and resistance to loosening in bolted joints.
Product Specifications
| L&S Part No. | 915 257 |
|---|---|
| OEM No. | 915257 |
| Unit of Sale | 1 |
| Key Features | - Internal serrations grip surfaces to resist loosening from vibration - 3/4 inch inner diameter fits standard 3/4 inch fasteners - Mild-steel construction ensures strength and machinability - Low-profile design fits under bolt heads or nuts - Suitable for machinery, automotive, and industrial use |
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